core: fix internationalization of nm-ssh-service

Signed-off-by: Jiří Klimeš <jklimes@redhat.com>
auth-dialog: 'dialog-password' is an icon name that shouldn't be translated

Signed-off-by: Jiří Klimeš <jklimes@redhat.com>
po: updated Czech (cs) translation

Signed-off-by: Jiří Klimeš <jklimes@redhat.com>
including locale.h
Merge pull request #33 from danfruehauf/czech_translation

Czech translation